mashape - mashape is a cloud API hub. It is a place to consume, distribute and manage private and public APIs. The mission is to to unlock and facilitate the distribution and consumption of data and services.
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Apigee - Intelligent and complete API platform
Zapier - Connect the apps you use everyday to automate your work and be more productive. 1000+ apps and easy integrations - get started in minutes.
WSO2 API Manager - WSO2 API Manager is a 100% open source enterprise-class solution that supports API publishing, lifecycle management, application development, access control, rate limiting and analytics in one cleanly integrated system.
n8n.io - Free and open fair-code licensed node based Workflow Automation Tool. Easily automate tasks across different services.